|Publication number||US8137285 B1|
|Application number||US 12/547,852|
|Publication date||Mar 20, 2012|
|Filing date||Aug 26, 2009|
|Priority date||Aug 26, 2008|
|Publication number||12547852, 547852, US 8137285 B1, US 8137285B1, US-B1-8137285, US8137285 B1, US8137285B1|
|Inventors||Shawn V. Regan, Isiah Daniel Smith, James M. Mewborne, Brett L. Netherton|
|Original Assignee||Rhythmlink International, Llc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (19), Referenced by (3), Classifications (8), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Priority is claimed to U.S. provisional patent application 61/091,831, filed Aug. 26, 2008, which is incorporated herein in its entirety by reference.
Electrical probes are finding more and more uses in medical procedures, most commonly in intra-operative monitoring. A probe can be connected to a source of electrical potential and be used to locate nerves in the patient or to determine the connections between nerves and the parts of the body they service. Probes are used, for example, in thyroid surgery, parotidectomy, acoustic neuroma surgery, brain and brainstem surgery, and surgery involving the spinal cord. Probes are particularly useful in surgery to help identify neural tissue from non-neural tissue such as tumor, scar tissue, normal non-neural tissue.
A particular type of probe is called a monopolar probe. When a monopolar probe is used, the current (or voltage) flows from the tip of the stimulation probe in all directions. Whether a response from a nerve is obtained depends on the distance to the nerve from the tip of the probe, the impedance of the tissue between the tip of the probe and the nerve, and the strength of the electrical stimulus, the health and integrity of the stimulated nerve, the appropriate recording paradigm, and additional factors. Monopolar stimulators are used most often in lumbar spine procedures and ear-nose-throat procedures, tumor resection procedures, and cranial nerve monitoring. The size and shape of the probe will vary to suit the nature of the use.
Electrical monopolar stimulation probes are typically also in spinal cord surgery to identify spinal and other nerves and to evaluate the correct placement of pedicle screws. Typically, during minimally invasive and endoscopic surgical approaches the probe needs to be a long probe that is inserted into the patient's side between or below the ribs and directed toward the spinal cord. The probe can be inserted through the surgical wound directly or via the endoscopic tubes or other access methods. Because of the distance the probe needs to travel and the inevitable resistance provided by tissue between the entrance and the target location, it is important for the physician to be able to maneuver it precisely along the way and to know when the probe tip is near the target within the spinal cord.
Accordingly, because of the sensitive and delicate nature of the procedures with which monopolar stimulating probes are used, there remains a need for improvements to such probes to make them easier to work with and more effective in locating their targets without injury to the patient.
The present invention is a monopolar stimulation probe system that may be provided in kit form. The present probe system is for monopolar stimulation of tissues and nerves to locate tissues and nerves as part of a surgerical procedure.
The probe system includes an insulated, electrically isolated, rigid, probe wire having two ends, a first end serving as the probe tip and the second, opposing end being inserted into a channel formed in a specially-configured handle. The handle securely holds the first end in electrical connection to an adaptor on a first end of a cable. The opposing second end of the cable runs to a connector that can be plugged into a neuro-monitoring device. Current can then flow from the neuro-monitoring device through the connector and cable to the adaptor in the handle and then into the probe and to the probe tip.
The handle holds the adaptor securely. It also provides a more secure gripping surface for the user, particularly when the present probe is being passed through several inches of human tissue. It may also provide a flat, terminal end for tapping the probe wire into tissue. The handle is configured to allow the adaptor to be easily inserted into the handle from the side where the adaptor is locked in place against axial movement, that is, movement parallel to the long dimension of the handle, and helps to hold the probe wire in position axially by resisting movement rearward, in the direction opposite the direction the probe is being advanced into the patient's tissue. Also, a series of “windows” along the sides of the handle allow the user to see the end of the probe wire as it advances toward and seats in the adaptor when the present probe system is being assembled.
An important feature of the present invention is the ease with which the components of the probe system are assembled. With the handle in one hand, the user presses the adaptor into an adaptor-configured portion of the handle's channel from the side. Then the second end of the wire probe in inserted into the channel in the end of the handle and advanced rearward until it seats in the adaptor. The end of the cable opposite the adaptor can then be plugged into a neuro-monitoring device. Disconnection of the electrical connection between the probe and the neuro-monitoring device is simply a matter of sliding the probe from the adaptor and out of the channel in the handle.
An important feature of the present invention is the rippled surface of the handle. The rippled handle enables the user to get a better purchase on it for driving the long probe through the tissue of the patient with both sufficient force and finer control. The series of openings along the front and back also allow the user to verify that the probe wire is seated in the adaptor, as well as to see that the probe wire has seated in the adaptor. Finally, the portion of the channel configured to receive the adaptor from the side of the handle allows not only quicker assembly, but securer hold of the adaptor even under the pressure of the insertion of the probe tip through tissue.
Other features and their advantages will be apparent to those skilled in the art of monopolar stimulation probe design from a careful reading of the Detailed Description of Preferred Embodiments accompanied by the following drawings.
In the figures,
The present invention is a monopolar stimulating probe system, generally referred to by reference number 10. Probe system 10 includes a wire probe 12, a handle 14, and a cable 16 for use with a neuro-monitoring device 100. The present probe system may be sold in the form of a sterile kit, as will be described below.
Referring now to the figures,
Preferably, set of ribs 28 includes a set of radial variations or bulges that are staggered with alternating bulges being offset from the long axis of handle. Windows 26 also alternate so that a window 26 formed in a bulge at the top of handle 14 is followed axially by a window 26 at the next bulge at the bottom of handle 14. While this exact surface configuration of handle 14 is not required, an effective surface configuration for allowing the surgeon non-slip control and, moreover, the ability to apply well-controlled axial force to handle 14 that is transmitted efficiently to wire probe 12 is critical. The present configuration provides good contact with the gloved fingers of the surgeon by providing variations in diameter along the axial length of probe 12 for better, more comfortable finger grip and for the application of controlled, non-slip, axial force. The use of windows 26 allows the surgeon to visually confirm that wire probe 12 is fully seated in adaptor 40.
Wire probe 12 is a thin but rigid electrical conductor 30, preferably made of steel, most preferably made of stainless steel, such as 316 stainless steel, with an insulating layer 32 made of a non-conductor, such as parylene C, a chemical vapor-deposited poly(p-xylylene) polymer.
The type of wire for probe 12 may be K-wire. K-wire is well-known in surgery such as, for example, holding bone fragments together, providing anchors for traction, and serving as guides for X-ray or fluoroscopy images. The length of the K-wire in the present wire probe 12 will depend on the purpose for which the probe is being used; it will be cut longer for less invasive procedures, such as lumbar spine procedures and stimulating pedical screws, and shorter for more invasive ones, such as lumbar discectomies and fusions with pedical screws, and still shorter probes for stimulating pedical screws in the thoracic and cervical areas. Another advantage of the present probe system is that handle 14 and cable 16 can be used with different lengths of probes 12 allowing for a kit to be developed of at least one handle 14, at least one cable 16 and a range of probe wires 12 of different lengths.
Wire probe 12 has a sensor tip 34 at a first end (see
Cable 16 has an adaptor 40 on first end 44 and a connector 48 at a second, opposing end 50; connector 42 may be identical to adaptor 40. Another advantage of the present cable 16 is that either first or second ends 44, 50, respectively, may be plugged into a neuro-monitoring device and the remaining end inserted into handle 14. The exterior shape of adaptor 40 (or connector 50), having enlarged portions, is the same shape as shaped portion 18 of channel 20 so that adaptor 40 fits snuggly into shaped portion 18 and handle 14 holds adaptor 40 securely in place axially, allowing no movement in the axial direction. Adaptor 40 is inserted from the side of handle 14 because the forces on adaptor, as transmitted from wire probe 12 are axial, and the shape of shaped portion 18 will prevent axial movement but, despite the axial resistance to movement, adaptor 40 is nonetheless easily inserted and removed in the radial direction, that is, from the side.
A comparison of
One of the most important advantages of the present invention is the fact that probe system 10 can be used to temporarily position wire probe 12 within the body, then used to identify neural tissue proximate to sensor tip 34, and then handle 14 can be removed while wire probe 12 remains positioned in the body. Wire probe 12 can guide a dilator or other surgical instrument as the surgeon slides the dilator or other device overtop or along wire probe 12. Then cable 16 can be reconnected to wire probe 14 either by inserting proximal end of wire probe 12 directly into adaptor 40 or alternatively via handle 14, and then resuming stimulation in a continuous or intermittent manner.
Referring now to
It will be apparent to those skilled in the art of probe design that modifications and substitution can be made to the foregoing preferred embodiments without departing from the spirit of the present invention, which is defined by the appended claim.
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|Cooperative Classification||A61N1/0551, A61N1/0529, A61B5/4893|
|European Classification||A61N1/05L, A61N1/05K1, A61B5/48Y4|
|Feb 8, 2012||AS||Assignment|
Owner name: RHYTHMLINK INTERNATIONAL, LLC, SOUTH CAROLINA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:REGAN, SHAWN V.;SMITH, ISIAH D.;MEWBORNE, JAMES M.;AND OTHERS;REEL/FRAME:027674/0922
Effective date: 20080826
|Sep 16, 2015||FPAY||Fee payment|
Year of fee payment: 4